ATMEGA128A-MN Atmel, ATMEGA128A-MN Datasheet - Page 164
![IC MCU AVR 128K FLASH 64VQFN](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA128A-MN
Manufacturer Part Number
ATMEGA128A-MN
Description
IC MCU AVR 128K FLASH 64VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128A-MN
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Core
AVR8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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18.2.1
8151H–AVR–02/11
Timing Example
Figure 18-2. Output Compare Modulator, Schematic
When the modulator is enabled the type of modulation (logical AND or OR) can be selected by
the PORTB7 Register. Note that the DDRB7 controls the direction of the port independent of the
COMnx1:0 bit setting.
Figure 18-3
ate in fast PWM mode (non-inverted) and Timer/Counter2 uses CTC waveform mode with toggle
Compare Output mode (COMnx1:0 = 1).
Figure 18-3. Output Compare Modulator, Timing Diagram
In this example, Timer/Counter2 provides the carrier, while the modulating signal is generated
by the Output Compare unit C of the Timer/Counter1.
The resolution of the PWM signal (OC1C) is reduced by the modulation. The reduction factor is
equal to the number of system clock cycles of one period of the carrier (OC2). In this example
the resolution is reduced by a factor of two. The reason for the reduction is illustrated in
18-3
high time is one cycle longer than the period 3 high time, but the result on the PB7 output is
equal in both periods.
(FPWM Mode)
(PORTB7 = 0)
(PORTB7 = 1)
at the second and third period of the PB7 output when PORTB7 equals zero. The period 2
( From Waveform Generator )
( From Waveform Generator )
COM21
COM20
COM1C1
COM1C0
(CTC Mode)
(Period)
OC1C
clk
OC2
PB7
PB7
illustrates the modulator in action. In this example the Timer/Counter1 is set to oper-
I/O
PORTB7
D
OC1C
D
D
OC2
Q
Q
Q
1
DATABUS
Modulator
2
0
1
DDRB7
D
Q
1
0
ATmega128A
3
Vcc
OC2 / PB7
OC1C /
Pin
Figure
164
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